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针对大型结构物连续同步顶升技术原理,使用四桩腿支点、每个桩腿支点4个顶升油缸的支撑结构;单支点内采用基于同步分流液压泵的容积同步控制方式;支点
间采用基于位移模糊的多点主从同步控制方式。建立了基于同步分流液压泵的液压系统和基于位移模糊控制的控制系统的仿真模型并进行联合仿真。对大型结构物连续同步顶升系统样机进行同步顶升试验,并对实验数据进行分析。结果表明:受实际工况中各种因素所导致的误差影响,实际同步误差比仿真同步误差略大,但仍满足同步要求,验证了所设计的液压控制系统的应用可行性。 相似文献
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《中国工程机械学报》2015,(4)
BZT1000型驮运架一体机的车载同步顶升系统主要用于大型桥梁的整体顶升,而其特殊的工况决定了顶升对象为较大负载、偏载.由多个液压缸形成的顶升装置在顶升过程中,会因多缸的相互作用而影响同步精度的进一步提高.为此设计了模糊解耦控制策略,通过与同等方式PID位置闭环控制策略的仿真比较,发现模糊解耦控制在较大负载、偏载的工况下多缸同步精度较高. 相似文献
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随着武器装备的发展,雷达、天线、激光武器和火炮等军事设备都配有自动化调平系统,为了适应多变的战场环境,提高机动性能和战场生存能力,需尽可能地提高调平系统调平精度、调平效率,保证调平过程稳定。本文提出了一种基于Sigmoid轨迹规划的相邻交叉耦合同步调平控制策略,可以适用于多点调平场合。采用D-H坐标法建立平台位姿解算模型,得到各调平支腿所需位移。基于Sigmoid函数对位移调整过程进行规划,得到支腿位移和时间的序列关系。根据相邻交叉耦合同步控制策略,建立各支腿耦合关系,通过同步控制器实现各支腿按同步比例系数的同步调整。经SimMechanics动力学建模Simulink仿真结果如下:各支腿位移调整曲线平滑、调平效率高、调平误差小于3′,同步误差减小约55.6%,同步调整时间减小约44.4%。 相似文献
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基于PLC的重大件货物液压滚装系统设计 总被引:2,自引:0,他引:2
设计了一种应用于重大件货物滚装的液压同步顶升和平移滚装系统.该系统利用多路同步顶升和平移技术实现重大件货物的卸车、就位、卸船,开发了相应的液压控制动力系统.利用PLC与组合式液压站实现了多点联控及多点同步液压顶升和平移,提高了重大件货物装卸的工作效率,减轻了人工劳动强度,增强了作业的自动化和安全性. 相似文献
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桥梁同步顶升动力监控系统研究与应用 总被引:1,自引:0,他引:1
随着桥梁改造工程的增多,桥梁同步顶升变得越来越普遍.为了解决桥梁同步顶升问题,研制了一套多液压缸同步项升动力监控系统.该动力监控系统采用"工控机 可编程控制器 液压控制系统"组成分布式控制系统,实现执行机构的分散控制、集中操作,信息的集中管理,既能满足多液压缸载荷不均衡同步升降,又能够对各顶升点的压力、位移和应力进行实时监控.通过在桥梁顶升调坡工程中的应用,验证了该动力监控系统的各项性能指标. 相似文献
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介绍了重庆朝天门大桥主桥移梁施工概况,详细论述了大吨位、短行程液压同步顶升下放系统的设计,指出了该系统的技术突破和技术创新,这对大吨位、短行程、刚性物体的同步顶升和下放施工有指导意义. 相似文献
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塔式起重机双油缸液压同步顶升系统同步性要求高,设计不够成熟.该文以三洋M125H5型塔机为例详细讲解了双油缸液压同步顶升系统的原理以及不同步问题的分析与解决过程,以便更好地理解和改进该系统. 相似文献
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R. I. Nepershin 《Journal of Machinery Manufacture and Reliability》2011,40(2):140-148
A model of axisymmetric formation of a flange from a flat blank with a hole by expanding by a hard punch with a fixed flat
flange is given, taking into consideration contact friction, change of wall thickness, strengthening of material, and the
tool bending radius. Elastic, elastic-plastic and hard-plastic process stages are studied. 相似文献
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详细地介绍了XSD型体视显微镜改制体视摄影器的方法与效果。并提出摄影接筒的长度可为30~225mm,其变化对摄影器总的放大倍数没有影响。 相似文献
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With car–parapet collision accidents in mind, a normal collision between a free-flying half ring and a simply supported beam with/without axial constraints is studied, in which an elastic–plastic half ring with an attached mass and the elastic–plastic beam are taken as the simplest models of a car and a parapet, respectively. Particular attention is paid to the energy partitioning between the two structures and the evolution of the contact regions during collision. A mass–spring finite difference (MS–FD) model is employed whilst the large deflection and axial stretching/compression are incorporated. The numerical results show that the less stiff (i.e. softer) structure will dissipate more energy and the contact regions will move away from the initial contact points. With the increase of the relative thickness of the beam to the ring, the final deformation of the half ring will transform from a “U” shape to a “W” shape. 相似文献
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《世界制造技术与装备市场》2007,(2):150
一次加工就可将刀槽表面抛光到镜面质量。DIAMETAL公司最新开发的MNT-MS金刚石砂轮以其卓越的加工能力而备受关注。他们甚至还可以一次就加工完成深度达若干毫米的刀槽。 相似文献
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蛇形机器人是一种高冗余度的机器人,由于其结构可变形,能够通过松软地面以及跨越(或避开)障碍物,能代替人完成某些危险场所如核电厂等维修及城市搜救.本文提出了一种类正弦波形的八关节三动杆蛇形机器人结构,做了运动模拟并给出了结论,该蛇形机器人的研制成功为设计相关类型的机器人提供了参考. 相似文献
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V. N. Danilov 《Russian Journal of Nondestructive Testing》2005,41(8):490-497
The influence of the pulsed operating mode on a bottom echo-signal level reflected from a plane surface of a cylindrical article is studied during variations in the article's radius. It is shown that the pulsed character of a signal smoothens this function significantly as compared to that in the previously computed continuous mode. Numerical estimates of the bottom echo signal have been made for the ultrasonic inspection of wheel-pair axles of railway vehicles. 相似文献
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Solving a new mathematical model for a hybrid flow shop scheduling problem with a processor assignment by a genetic algorithm 总被引:1,自引:1,他引:0
Amin Ziaeifar Reza Tavakkoli-Moghaddam Khosro Pichka 《The International Journal of Advanced Manufacturing Technology》2012,61(1-4):339-349
This paper presents a new mathematical model for a hybrid flow shop scheduling problem with a processor assignment that minimizes makespan (i.e., C max) and cost of assigning a number of processors to stages. In this problem, it is assumed that there are a number of parallel identical processors which are assigned to all of the stages with an unlimited intermediate storage between any two successive stages. To solve such a hard problem, first a new heuristic algorithm is proposed to compute the makespan that is embedded in the proposed genetic algorithm in order to find the best sequence of jobs, and then processors are assigned to the stages simultaneously. A number of test problems have been solved and related results are illustrated and analyzed. 相似文献
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集散控制系统在啤酒厂糖化车间的应用 总被引:4,自引:0,他引:4
王念春 《工业仪表与自动化装置》2000,(2):21-24,55
本文简介了工控组态软件 T350 0、欧陆下位机的特点 ,给出了一个在啤酒厂糖化车间应用的实例。 相似文献